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    "`set_option opt val in tacs` (the tactic) acts like `set_option opt val` at the command level,\nbut it sets the option only within the tactics `tacs`. ",
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    "The tactic\n```\nintro\n| pat1 => tac1\n| pat2 => tac2\n```\nis the same as:\n```\nintro x\nmatch x with\n| pat1 => tac1\n| pat2 => tac2\n```\nThat is, `intro` can be followed by match arms and it introduces the values while\ndoing a pattern match. This is equivalent to `fun` with match arms in term mode.\n",
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